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<title>Arranging Layout of the Class Hierarchy</title>
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          <h1 class="mb-0 p-1 ">GoJS</h1>
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    <!-- Start of GoJS sample code -->
    
    <script src="../release/go.js"></script>
    <div class="p-4 w-full">
  <script src="ArrangingLayout.js"></script>

  <script id="code">
    function init() {
      var $ = go.GraphObject.make;

      myDiagram =
        $(go.Diagram, "myDiagramDiv",  // create a Diagram for the DIV HTML element
          {
            initialAutoScale: go.Diagram.Uniform,
            layout:
              $(ArrangingLayout,
                { // create a circular arrangement of circular layouts
                  primaryLayout: $(go.CircularLayout),  // must specify the primaryLayout
                  arrangingLayout: $(go.CircularLayout, { nodeDiameterFormula: go.CircularLayout.Circular, spacing: 30 }),

                  // Uncommenting this filter will force all of the nodes and links to go into the main subset and thus
                  // will cause all those nodes to be arranged by this.arrangingLayout, here a CircularLayout,
                  // rather than by the this.sideLayout, which by default is a GridLayout.
                  //filter: function(part) { return true; },

                  // additional custom properties for use by preparePrimaryLayout
                  _colors: ["red", "orange", "yellow", "lime", "cyan"],  // possible node colors
                  _colorIndex: 0,  // cycle through the given colors

                  // called for each separate connected subgraph
                  preparePrimaryLayout: function(lay, coll) {  // color all of the nodes in each subgraph
                    var root = null;  // find the root node in this subgraph
                    coll.each(function(node) {
                      if (node instanceof go.Node && node.findLinksInto().count === 0) root = node;
                    });
                    var color = "white";  // determine the color for the nodes in this subgraph
                    if (root !== null) {
                      // root.key will be the name of the class that this node represents
                      // Special case: "LayoutNetwork", "LayoutVertex", and "LayoutEdge" classes are "violet"
                      if (root.key.indexOf("Layout") === 0 && root.key.length > "Layout".length) {
                        color = "violet";
                      } else {  // otherwise cycle through the Array of colors
                        color = this._colors[this._colorIndex++ % this._colors.length];
                      }
                    }
                    coll.each(function(node) {  // assign the fill color for all of the nodes in the subgraph
                      if (node instanceof go.Node) {
                        var shape = node.findObject("SHAPE");
                        if (shape !== null) shape.fill = color;
                      }
                    });
                  },

                  prepareSideLayout: function(lay, coll, b) {  // called once for the sideLayout
                    // adjust how wide the GridLayout lays out
                    lay.wrappingWidth = Math.max(b.width, this.diagram.viewportBounds.width);
                  }
                })
          });

      myDiagram.nodeTemplate =
        $(go.Node, go.Panel.Auto,
          $(go.Shape, { name: "SHAPE", figure: "RoundedRectangle", fill: "lightgray" },
            new go.Binding("fill", "color")),
          $(go.TextBlock, { margin: 2, textAlign: "center" },
            new go.Binding("text", "key", function(s) {
              // insert newlines between lowercase followed by uppercase characters
              var arr = s.split("");
              for (var i = 1; i < arr.length-1; i++) {
                var a = arr[i-1];
                var b = arr[i];
                if (a === a.toLowerCase() && b === b.toUpperCase()) {
                  arr.splice(i, 0, "\n");
                  i += 2;
                }
              }
              return arr.join("");
            })));

      myDiagram.linkTemplate =
        $(go.Link,
          { layerName: "Background" },
          $(go.Shape));

      // Collect all of the data for the model of the class hierarchy
      var nodeDataArray = [];

      // Iterate over all of the classes in "go"
      for (var k in go) {
        var cls = go[k];
        if (!cls) continue;
        var proto = cls.prototype;
        if (!proto) continue;
        proto.constructor.className = k;  // remember name
        // find base class constructor
        var base = Object.getPrototypeOf(proto).constructor;
        if (base === Object) {  // "root" node?
          nodeDataArray.push({ key: k });
        } else {
          // add a node for this class and a tree-parent reference to the base class name
          nodeDataArray.push({ key: k, parent: base.className });
        }
      }

      // Create the model for the hierarchy diagram
      myDiagram.model = new go.TreeModel(nodeDataArray);
    }

    window.addEventListener('DOMContentLoaded', init);
  </script>

<div id="sample">
  <div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:800px; min-width: 200px"></div>
  <p>
    This sample demonstrates a custom Layout, <a>ArrangingLayout</a>, that provides layouts of layouts.
    It assumes the graph should be split up and laid out by potentially three separate Layouts.
  </p>
  <p>
    The first step of ArrangingLayout is that all unconnected nodes are separated out to be laid out later by
    the <a>ArrangingLayout.sideLayout</a>, which by default is a <a>GridLayout</a>.
  </p>
  <p>
    The remaining nodes and links are partitioned into separate subgraphs with no links between subgraphs.
    The <a>ArrangingLayout.primaryLayout</a> is performed on each subgraph.
  </p>
  <p>
    If there is more than one subgraph, those subgraphs are treated as if they were individual nodes and are
    laid out by the <a>ArrangingLayout.arrangingLayout</a>.
  </p>
  <p>
    Finally the unconnected nodes are laid out by <a>ArrangingLayout.sideLayout</a> and they are all positioned
    at the <a>ArrangingLayout.side</a> Spot relative to the main body of nodes and links.
  </p>
  <p>
    This extension layout is defined in its own file, as <a href="ArrangingLayout.js">ArrangingLayout.js</a>.
  </p>
</div>
    </div>
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